super cheap and works with raspberry pi
decided to take a punt on one of these as it was so cheap - intending to use it with raspberry pi. good news is it works fine with no messing about with raspbian ( 12/2012) ; all i had to do was run the wifi utility that appeared on the desktop and it connected and seems rock-solid.
chipset is realtek for those who are interested so should work with other versions of linux without too much of a struggle. item is branded as pluscom. also has a wps button...